i like the jasmine one, long length. BUT the davids one is cute too, and it says taffeta so you know it will look more formal than a regular sundress, so that helps.
i just think the solid color of the bahama breeze would photograph better than the floral patten. since the floral is so bold and bright, it might take away from the details on your own dress. patterns are ok if they are softer, more muted, earthy colors.